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Heading Alignment Cone
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Heading Alignment Cylinder
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Heading Alignment Center
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Heading Alignment Circle
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Similar to HAC
ABA - Astronaut Boarding Aircraft
ABC - Active Body Control
ABC - Audio Bus Coupler
ABCL - As Built Configuration List
ABE - Anomalous Biological Entities
ABHRS - As Built Hardware Reporting System
ABL - Allocated BaseLine
View all in NASA